Weather will be good, but not too hot just yet. LA is usually around 20 to 30 degrees each day. Seattle is similar, but hovering more around 15 to 24 degrees at the most.
It is probably ideal because it is not in the middle of summer. In saying that, if you are spotting in LAX, they get the sea breeze so it doesn't get too hot like the inland areas. Seattle gets warm in the summer but very rarely over 30degrees or more (I lived there for a couple of years).
All in all, should be perfect spotting weather!
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